CN103278689A - Test method for determining synchronous reactance of permanent magnet generator by steady-state short-circuit method - Google Patents
Test method for determining synchronous reactance of permanent magnet generator by steady-state short-circuit method Download PDFInfo
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- CN103278689A CN103278689A CN2013101511989A CN201310151198A CN103278689A CN 103278689 A CN103278689 A CN 103278689A CN 2013101511989 A CN2013101511989 A CN 2013101511989A CN 201310151198 A CN201310151198 A CN 201310151198A CN 103278689 A CN103278689 A CN 103278689A
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Abstract
The invention aims at establishing a test method for determining the synchronous reactance of a permanent magnet generator by a three-phase steady-state short-circuit method and determining the direct axis synchronous resistance Xd and the quadrature axis synchronous resistance Xq of the permanent magnet generator. According to the test method for determining the synchronous reactance of the permanent magnet generator by the steady-state short-circuit method, which is disclosed by the invention, the direct axis synchronous resistance Xd and the quadrature axis synchronous resistance Xq of a winding are finally determined by drawing a vector diagram of a three-phase steady-state short-circuit of the permanent magnet generator, deducing the calculation formula of the synchronous resistances Xd and Xq under the steady-state short-circuit and conducting the testing of a stator resistor Ra as well as a no-load test and a three-phase steady-state short-circuit test; and the synchronous reactance can be obtained without load, and thus convenience and directness are realized and load equipment is omitted.
Description
Technical field
The present invention relates to a kind of method of testing of determining the magneto synchronous reactance by the steady-state short-circuit method.
Background technology
Magneto is one of most important equipment in the wind-powered electricity generation unit, and the magneto synchronous reactance is to generator stable operation analysis, fault analysis and safeguard and overhaul all have vital role.Simultaneously, the magneto synchronous reactance is to set up the magneto mathematical model, carries out prerequisite and the basis of computer control and analysis.
Because the excitation of magneto is constant, different with the type of conventional generator, the method for analyzing and testing its synchronous reactance has certain degree of difficulty, does not also have the method for testing at the magneto synchronous reactance at present.
Summary of the invention
The objective of the invention is to determine by the steady-state short-circuit method method of testing of magneto synchronous reactance, by this method of testing, reach the purpose of determining magneto direct-axis synchronous reactance Xd and quadrature axis synchronous reactance Xq.Technical scheme of the present invention is: a kind ofly determine the method for testing of magneto synchronous reactance by the steady-state short-circuit method, the test of magneto steady-state short-circuit, test E
0And the angle theta between the I is finally determined magneto direct-axis synchronous reactance Xd and quadrature axis synchronous reactance Xq, and the equation computing formula during magneto load steady-state short-circuit is:
A) ignore the computing formula of stator direct current resistance
Very little at the stator direct current resistance, ignore under the situation of its influence, be calculated as follows:
X
d=E
0／I （1）
I=E
0／X
d （2）
B) computing formula of consideration stator direct current resistance
X
d＝（E
0－I·cos(θ)·R
a）／I·sin(θ) （3）
X
q＝I·sin(θ)·R
a／I·cos(θ) （4）
In the formula:
I-permanent magnet generator machine stator short-circuit current;
E0-no-load emf;
Ra-stator resistance;
θ-E
0And the angle between the I;
Id-direct-axis current;
Iq-friendship shaft current
By the test of three-phase steady-state short-circuit, measure magneto stator current I, no-load emf E
0, stator resistance Ra, no-load emf E
0And the angle theta between the stator short-circuit current I, and finally determine stable state parameter d-axis and quadrature axis synchronous reactance Xd and Xq value.Concrete steps are as follows:
Step 1, carry out the test of stator resistance Ra: stator resistance Ra is one of inscape of magneto vector plot, tests out its phase resistance, and carries out suitable correction according to temperature, so that when synchronous reactance is calculated, considers the influence of stator resistance;
Step 2, the no-load test of carrying out: test no-load characteristic, no-load emf E
0And initial position angle: magneto is under different rotating speeds, and its no-load emf difference, synchronous reactance also change thereupon, and the initial position angle under the zero load must be at first tested at the merit angle when determining load, i.e. angle between unloaded next phase voltage and the rotor-position;
Step 3, carry out three-phase steady-state short-circuit test: measure and measure magneto stator current I, no-load emf E
0And the angle theta between the stator short-circuit current I is determined magneto direct-axis synchronous reactance Xd and quadrature axis synchronous reactance Xq;
Step 4, according to above method of testing, obtain each computing parameter, utilize formula (1), formula (2) or formula (3), formula (4), determine winding direct-axis synchronous reactance Xd and quadrature axis synchronous reactance Xq.
The three-phase steady-state short-circuit is the special method of operation of magneto, and the stator current of generation is fully by excitation magnetic potential and synchronous reactance and internal resistance decision.Three-phase steady-state short-circuit family curve has directly reacted the operation mechanism of magneto, and meaning is extremely important.The steady-state short-circuit method is determined the method for testing of magneto synchronous reactance, and bringing onto load just can not obtain synchronous reactance, and is directly convenient, saves load equipment.
Description of drawings
Fig. 1: the vector plot of magneto three-phase steady-state short-circuit.
Embodiment
As shown in Figure 1, be the vector plot of magneto three-phase steady-state short-circuit.The magneto excitation produces magnetic field by fixing magnet steel, if its rotating speed is constant, it is constant that magnet steel produces the magnetic induction size in magnetic field, and induced potential is also constant.During magneto three-phase steady-state short-circuit, output voltage values is 0.According to above characteristic, the vector plot of magneto when drawing the three-phase steady-state short-circuit.
The vector plot of magneto during based on the three-phase steady-state short-circuit is set up and is a kind ofly determined the method for testing of magneto synchronous reactance by the steady-state short-circuit method, by the steady-state short-circuit test of magneto, test E
0And the angle theta between the I is finally determined magneto direct-axis synchronous reactance Xd and quadrature axis synchronous reactance Xq, and the equation computing formula during the magneto steady-state short-circuit is:
A) ignore the computing formula of stator direct current resistance
Very little at the stator direct current resistance, ignore under the situation of its influence, be calculated as follows:
X
d=E
0／I （1）
I=E
0／X
d （2）
B) computing formula of consideration stator direct current resistance
X
d＝（E
0－I·cos(θ)·R
a）／I·sin(θ) （3）
X
q＝I·sin(θ)·R
a／I·cos(θ) （4）
In the formula:
I-permanent magnet generator machine stator short-circuit current;
E0-no-load emf;
Ra-stator resistance;
θ-E
0And the angle between the I;
Id-direct-axis current;
Iq-friendship shaft current
By the test of three-phase steady-state short-circuit, measure magneto stator current I, no-load emf E
0, stator resistance Ra, no-load emf E
0And the angle theta between the stator short-circuit current I, and finally determine stable state parameter d-axis and quadrature axis synchronous reactance Xd and Xq value, concrete steps are as follows:
Step 1, carry out the test of stator resistance Ra; Stator resistance Ra is one of inscape of magneto vector plot, tests out its phase resistance, and carries out suitable correction according to temperature, so that when synchronous reactance is calculated, considers the influence of stator resistance; Minitype permanent magnetism generator unit stator direct current resistance is bigger, when testing and calculating, must consider the influence of stator direct current resistance, just can accurately determine synchronous reactance;
Step 2, the no-load test of carrying out: test no-load characteristic, no-load emf E
0And initial position angle; The magneto no-load curve is the relation curve of rotating speed and no-load voltage, and it is straight line, has directly reacted the size that different rotating speeds lower magnetic steel magnetic pole produces electromotive force, synchronous reactance determine to depend on no-load curve; Magneto is under different rotating speeds, and its no-load emf difference, synchronous reactance also change thereupon, and the initial position angle under the zero load must be at first tested at the merit angle when determining load, i.e. angle between unloaded next phase voltage and the rotor-position;
Step 3, carry out three-phase steady-state short-circuit test: measure and measure magneto stator current I, no-load emf E
0And the angle theta between the stator short-circuit current I is determined magneto direct-axis synchronous reactance Xd and quadrature axis synchronous reactance Xq; Short-circuit characteristic is the basic map of magneto, is the relation curve of short-circuit current and rotating speed.It is straight line basically, and along with the raising of rotating speed, short-circuit current makes progress slightly.The short-circuit current in three-phase steady-state short-circuit when operation is produced by the magnetic field of generator electromotive force own fully, and the not significant change with change in rotational speed, and it has directly reacted the operation mechanism of magneto, the reaction that also is synchronous reactance on electric;
Step 4, according to above each method of testing, obtain each parameter, when ignoring the influencing of stator direct current resistance, utilize formula (1), formula (2), determine winding direct-axis synchronous reactance Xd and quadrature axis synchronous reactance Xq.When considering the influencing of stator direct current resistance, utilize formula (3), formula (4), determine winding direct-axis synchronous reactance Xd and quadrature axis synchronous reactance Xq.
Claims (1)
1. determine to it is characterized in that the method for testing of magneto synchronous reactance by the steady-state short-circuit method for one kind: by the steady-state short-circuit test of magneto, test E
0And the angle theta between the I is finally determined magneto direct-axis synchronous reactance Xd and quadrature axis synchronous reactance Xq, and the equation computing formula during the magneto steady-state short-circuit is:
A) ignore the computing formula of stator direct current resistance
Very little at the stator direct current resistance, ignore under the situation of its influence, be calculated as follows:
X
d=E
0／I （1）
I=E
0／X
d （2）
B) computing formula of consideration stator direct current resistance
X
d＝（E
0－I·cos(θ)·R
a）／I·sin(θ) （3）
X
q＝I·sin(θ)·R
a／I·cos(θ) （4）
In the formula:
I-permanent magnet generator machine stator short-circuit current;
E0-no-load emf;
Ra-stator resistance;
θ-E
0And the angle between the I;
Id-direct-axis current;
Iq-friendship shaft current
By the test of three-phase steady-state short-circuit, measure magneto stator current I, no-load emf E
0, stator resistance Ra, no-load emf E
0And the angle theta between the stator short-circuit current I, and finally determine stable state parameter d-axis and quadrature axis synchronous reactance Xd and Xq value, concrete steps are as follows:
Step 1, carry out the test of stator resistance Ra: stator resistance Ra is one of inscape of magneto vector plot, tests out its phase resistance, and carries out suitable correction according to temperature, so that when synchronous reactance is calculated, considers the influence of stator resistance;
Step 2, the no-load test of carrying out: test no-load characteristic, no-load emf E
0And initial position angle, magneto is under different rotating speeds, and its no-load emf difference, synchronous reactance also change thereupon, and the initial position angle under the zero load must be at first tested at the merit angle when determining load, i.e. angle between unloaded next phase voltage and the rotor-position;
Step 3, carry out three-phase steady-state short-circuit test: measure and measure magneto stator current I, no-load emf E
0And the angle theta between the stator short-circuit current I is determined magneto direct-axis synchronous reactance Xd and quadrature axis synchronous reactance Xq;
Step 4, according to above method of testing, obtain each computing parameter, utilize formula (1), formula (2) or formula (3), formula (4), determine winding direct-axis synchronous reactance Xd and quadrature axis synchronous reactance Xq.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106645950A (en) * | 2016-11-18 | 2017-05-10 | 广东电网有限责任公司电力科学研究院 | Synchronous generator power angle real-time measurement method and device |
| CN107085161A (en) * | 2017-04-28 | 2017-08-22 | 国家电网公司 | A kind of live steady-state short-circuit characteristic test method of large-scale phase modifier transformer group |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN106645950A (en) * | 2016-11-18 | 2017-05-10 | 广东电网有限责任公司电力科学研究院 | Synchronous generator power angle real-time measurement method and device |
| CN106645950B (en) * | 2016-11-18 | 2019-05-28 | 广东电网有限责任公司电力科学研究院 | A kind of power angle of synchronous generator method for real-time measurement and device |
| CN107085161A (en) * | 2017-04-28 | 2017-08-22 | 国家电网公司 | A kind of live steady-state short-circuit characteristic test method of large-scale phase modifier transformer group |
| CN107085161B (en) * | 2017-04-28 | 2019-06-07 | 国家电网公司 | A kind of large size phase modifier-transformer group scene steady-state short-circuit characteristic test method |
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Application publication date: 20130904 |